Dental chip-blower.



F. S. YODER.

DENTAL CHIP BLOWER.

APPLICATION man Mms, 1915.

dental appliances, and it pertains particufrnarran FREDERICK S. YODEB, GF `WEENERSVILLE, PENNSYLVANQA.

DENTAL GH To all whom it may concern:

Be it known that l, FREDERICK S. Yonne, a citizen of the United States, residing at Wernersville, in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements -in Dental Chip-Blowers, of which the following is a specilication.

This invention relates to improvements in larly to a chip blower in the orrn or" a hand bulb provided with a stein and nozzle, whereby the chips resulting from drilling are blown from the tooth cavity. ln the use of such devices, there is great danger, from a sanitary view point, of disease germs being transmitted from one patient to another, due to the tact that the'bulb'when released will draw into the nozzle, particles of saliva only to be later blown into the mouth or" ann other person.

ll/ly invention comprises a double acting valve located in the stem between thenozzle and the bulb, whereby the air from the bulb niay be discharged through the nozzle, but the intake or supply means is located at a point outside of the mouth of the patient, thus preventing the bulb from drawing its supply 'of air through the nozzle. ,In this manner l overcome the very serious objection above referred to,w and l accomplish it by means of a simple valve construction, the details of which will be hereinafter specifically set forth.

rllhe invention is more fully described in the following spe'cication and clearly illustrated in the accompanying drawing, in which l have shown my device, in enlarged form, in central longitudinal section. The numeral'l designates a compressible bulb, preferably of rubber or like material;

'2 designates the stem; 3 the nozzle, and i the valve casing. The bulb, stem andl nozzle -on the device shown are of ordinary construction, 'but instead of attaching the bulb to the one end of the stem, l interpose the -valvevcasing 4 with its valve arrangement which l will now describe. This casing Il is provided at one end with a bead 45 over which the contracted end of the bulb 6 nts. The other end ci the casingis screw-thread Specification ci? Letters Eatent.

vscrew-threaded end 7 of the i915. serial no, ear-ar.

ed internally to accommodate stem 2, which stein is provided with a collar 18 adapted to bear againstthe end of Athe casing` to liinitthe movement of the stem when beinginserted inthe casing.

Thel inner wall of the casing Ll is', tapered in opposite directions, to forni two distinct valve seats 8 and 9 and a valve l0, which vserves as the outlet or exhaust valve, is normally seated against the seat 9. This valve is formed with a stem 11 which projects rearwardly, toward the bulb, 4and carries a nut l2 on its extremity. Between this nut and the valve, is interposed a spring 13,

which serves to keep the valve seated, as stated. l Surrounding the valvezstein ll and litting loosely over it, is a `conical valve lll, adapted to" serve as the intake valve, and to seat against the opposite tapered seat, 8,' in the casing.l lRadizuting from this valve seat ,8, are a plurality ot openings l5 thrfnigh4 the wall of the casing, 'which openings serve to supply air to the intake valve.

The operation is extremely simple: When the parts are assembled, and the bulb l is the externally compressed, the air pressure will open the' valve 10 against the tension oi' the spring 13, andv permit the air, under pressure, to

pass through the stem and out of the nozzle.

YWhen the pressure on the bulb is released, the spring will i mediately close the valve l0, thus proventi g any intake through the nozzle, and, at the same time, the suction caused by the expanding bulb will draw air through the openings 15,-the conical valve ll being free to unseat.

It is evident that with this device, nothing can be drawn into the bulb thr/oughthe nozzle, and that all the air to enter the bulb must pass through the intake valve, which, being located at a point remote from the nozzle, will lnot permit the entrance thereto of, particles from the mouth of the patient.

Having (thus *,scribed my invention, what I claim and desi eV to secure by Letters Patn ent is l, In a dental chip blower, the conibinaf ble' acting valve in the easing and means for keeping the exhaust or outlet Valve opening normally closed.

2. In a, dental'chp blower, a compressble bulb, :LV hollow stem attached thereto, and

a n ozzle on the end of tbe Stem, in combinetlon with a valve easlng located in the stem between' the bulb and the nozzle, two

oppositely tapered Vvalve-seats in the casing, a. valve adapted to normally close the out- 10 lei'J :Ez-omsmd casing, a spring to keep said valve seated, and an intake Valve adapted f to be closed by press'ule from the bulb when the outlet valve s opened.

In testimony whereof l ax my signature.

FREDERICK S. YODER. 

